What is the difference between bladder pressure tanks and diaphragm pressure tanks? ｜Aquasky

Diaphragm Pressure Tanks

Diaphragm pressure tanks can be divided into two areas: one for air, and one for water. They’re separated by a rubber diaphragm that’s permanently bonded to the inside of the tank. This rubber lining acts as the bladder would, but its connection is permanent to the tank. This particular part of the diaphragm pressure tank is not interchangeable. The diaphragm pressure tank is the most efficient pressure tank and requires the least amount of maintenance.

As water is pumped into the lower section, the diaphragm pushes up into the air area, when the pressure is greater than the preset high-pressure value, which triggers a switch that shuts off the pump. On the contrary, when there is water demand, the air squeezed in the air pressure zone is released, and the rubber diaphragm is squeezed. The water squeezed toward the joint, causing the water to flow out.

Bladder Pressure Tanks

Bladder pressure tanks use two separate areas for air and water. The bladder is a large balloon filled with air that expands and contracts, triggering the pump. Since they’re self-contained, they don’t have the issues of a diaphragm or a single chamber tank.

The bladder Pressure Tank is a balloon inside a tank that fills with water when there is pressure that is greater than that already in the bladder. A relief valve stops the water from flowing backward and reserves the water and pressure for use by the device it is feeding. One of the bladder pressure tank's problems is having the bladder “get stuck to itself” and remain uninflated. This can cause rapid pump cycling.

Diaphragm pressure tanks and bladder pressure tanks both have advantages and disadvantages, we can not say in a word, but according to the characteristics of both and local conditions, we can choose the better one.

Comparison table:

	Diaphragm Pressure Tanks	Bladder Pressure Tanks
Photo
Areas	Divided into two areas: one for air, and one for water.	Two separate areas for air and water
Water Outlet	A stainless steel joint and is directly welded to the tank	The joint is locked by the screw and the connecting flange
Replaced	The diaphragm or FDA-grade PP plastic can't be replaced	The bladder can be replaced
Risk of Damage	X	Air leakage / elastic fatigue of the rubber cap.
Maintenance	No maintenance	Regular maintenance
Cost	The entire tank needs to be replaced.	Only the bladder needs to be replaced.
Advantages	The most efficient pressure tank and requires the least amount of maintenance.	It is suitable for large tanks’ design ex: 2000L, 3000L or 5000L …etc.
Famous Manufacturer	Amtrol / Wessels / GWS	Varem / Zilmet / Aquasystem

AQUASKY is neither a large-scale business nor a recognizable brand, but we provide you with excellent pressure tanks, reasonable prices,s, and the best-customized service. Our team is small but excellent! We are a trustworthy company!

If you are interested in our pressure tanks, please link to our web site.

Web: www.aquaskyplus.com

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